Konovalova, Anastasiia Kim, Hyemi Kim, Sangwon Lim, Ahyoun Park, Hyun Seo Kraglund, Mikkel Rykaer Aili, David Jang, Jong Hyun Kim, Hyoung-Juhn Henkensmeier, Dirk 2024-01-19T21:33:38Z 2024-01-19T21:33:38Z 2021-09-05 2018-10 0376-7388 https://pubs.kist.re.kr/handle/201004/120829 Anion exchange membranes (AEMs) conduct selectively hydroxide ions, while KOH doped polybenzimidazole is an ion-solvating polymer, conducting both potassium and hydroxide ions. In this work, meta-polybenzimidazole (mPBI) was blended with FAA3, a commercially available AEM, in the ratios of 2: 1, 3: 1, 4: 1, 5: 1 and 1: 0. Doping was done by immersion in 0, 10, 15, 20, 25 and 30 wt% KOH solutions, giving rise to 30 membranes which were analyzed for their swelling behavior during doping, there composition (polymer, water, KOH), their mechanical properties and their through-plane conductivity in KOH solutions. Especially PF-41 showed higher tensile strength and Young's modulus than mPBI under all tested KOH concentrations. The highest conductivity of 166 mS cm(-1) was observed for PF-51 doped in 25% KOH, 80% higher than for mPBI. In an alkaline stability test, blend membranes showed higher tensile strength, Young's modulus and lower weight loss than mPBI after 4 weeks at 85 degrees C in 25 wt% KOH solution. PF-31 and PF-41 were also tested in an electrolysis cell, where they showed cell resistance comparable to mPBI. Because systems without cathode feed can be quite efficient, the permeability of membranes for KOH solutions was investigated. English ELSEVIER SCIENCE BV Blend membranes of polybenzimidazole and an anion exchange ionomer (FAA3) for alkaline water electrolysis: Improved alkaline stability and conductivity Article 10.1016/j.memsci.2018.07.074 1 JOURNAL OF MEMBRANE SCIENCE, v.564, pp.653 - 662 JOURNAL OF MEMBRANE SCIENCE 564 653 662 N scie scopus 000442653900064 2-s2.0-85050850954 Engineering, Chemical Polymer Science Engineering Polymer Science Article SOLVATING POLYMER ELECTROLYTE KOH-DOPED POLYBENZIMIDAZOLE FUEL-CELLS POTASSIUM HYDROXIDE PERFORMANCE PBI Polybenzimidazole Anion exchange membranes Blend polymers Alkaline electrolysis Alkaline stability